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1.
Another name for an older male who is very tan during the winter months and hangs out with the college crowd in public.
Look at this cock-tan at the bar partying like it's 1999.
by Chokatay October 26, 2010
 
2.
A grading of a suntan where the rest of a mans skin is equal in color to the skin tone on his flaccid penis.

Not to be confused with George Hamilton who is a Tan cock.
I am not going to the beach this summer until I at least get Cock tan.
by 1veryangrybuddhist February 15, 2011